EDI device

Abstract

The utility model discloses an EDI (Electrodeionization) device, which belongs to the field of EDI and comprises an anode plate, a first partition plate, an anode film, a second partition plate, at least one group of treatment units, a first cation film, a third partition plate, a cathode film, a fourth partition plate and a cathode plate which are sequentially arranged from left to right, the treatment unit comprises a second cation membrane, a fifth partition plate, a first anion membrane, a sixth partition plate, a bipolar membrane, a seventh partition plate, a third cation membrane, an eighth partition plate, a second anion membrane and a ninth partition plate which are sequentially arranged from left to right, anion exchange resin is arranged in the sixth partition plate, cation exchange resin is arranged in the seventh partition plate, and the cation exchange resin is arranged in the ninth partition plate. The water outlet of the sixth partition plate is communicated with the water inlet of the seventh partition plate. According to the utility model, continuous online cleaning can be realized, and high-concentration saline water can be treated.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of EDI, especially relates to a EDI device. BACKGROUND

[0002] In today's many high water quality requirements of industrial field and advanced scientific research application scene, EDI (Electrodeionization, continuous electric desalination) device plays a very key role. Its core working principle is to realize the efficient removal of ions in aqueous solution by the synergistic effect between anion and cation membranes and ion exchange resin, and then obtain high purity water.

[0003] However, the current EDI device has a significant limitation. Although the ion exchange resin plays an indispensable role in the ion exchange process, due to its own limited exchange capacity, this feature largely restricts the application range and processing efficiency of the entire EDI device. Due to the limitation of ion exchange resin exchange capacity, the traditional EDI device is difficult to handle high concentration brine. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a EDI device to overcome at least one of the above-mentioned defects in the prior art.

[0005] To achieve this purpose, the utility model adopts the following technical scheme:

[0006] The utility model provides a EDI device, including the anode plate, first baffle, anode membrane, second baffle, at least one group of processing unit, first cation membrane, third baffle, cathode membrane, fourth baffle and cathode plate that are sequentially arranged from left to right, and the processing unit includes second cation membrane, fifth baffle, first anion membrane, sixth baffle, bipolar membrane, seventh baffle, third cation membrane, eighth baffle, second anion membrane and ninth baffle that are sequentially arranged from left to right, the sixth baffle has anion exchange resin in, the seventh baffle has cation exchange resin in, and the water outlet of sixth baffle and the water inlet of seventh baffle are communicated.

[0007] Preferably, the water outlet of seventh baffle and the water inlet of ninth baffle are communicated, and the ninth baffle has anion and cation exchange resin in.

[0008] Preferably, the processing unit is 1-200 groups.

[0009] Preferably, the thickness of first baffle, second baffle, third baffle, fourth baffle, fifth baffle and eighth baffle is 0.5-1mm.

[0010] Preferably, the thickness of sixth baffle, seventh baffle and ninth baffle is 1-20mm.

[0011] Preferably, the middle part of the sixth partition plate has a first cavity, and anion exchange resin is arranged in the first cavity.

[0012] Preferably, the middle part of the seventh partition plate has a second cavity, and cation exchange resin is arranged in the second cavity.

[0013] Preferably, the middle part of the ninth partition plate has a third cavity, and anion-cation exchange resin is arranged in the third cavity.

[0014] The utility model discloses the beneficial effects are:

[0015] 1, adopt bipolar membrane and DEI combination, realize continuous on -line cleaning, reduced subsequent resin regeneration frequency, prolongs the regeneration period, reduces the resin regeneration wastewater amount, is helpful to maintain ion exchange resin in the average exchange capacity of whole use period, makes it can continuously stably provide effective ion exchange service for water treatment process etc.

[0016] 2, through increasing corresponding ion membrane and ion exchange resin, can handle higher concentration brine, can realize brine one -step method preparation ultrapure water. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the structure schematic diagram of the utility model.

[0018] The marks in the drawing are: 1-anode plate, 2-first partition plate, 3-anode membrane, 4-second partition plate, 6-first cation membrane, 7-third partition plate, 8-cathode membrane, 9-fourth partition plate, 10-cathode plate, 51-second cation membrane, 52-fifth partition plate, 53-first anion membrane, 54-sixth partition plate, 55-bipolar membrane, 56-seventh partition plate, 57-third cation membrane, 58-eighth partition plate, 59-second anion membrane, 510-ninth partition plate, 511-anion exchange resin, 512-cation exchange resin, 513-anion-cation exchange resin, 541-first cavity, 561-second cavity, 5101-third cavity. DETAILED DESCRIPTION

[0019] The utility model will be further explained in conjunction with the drawing and specific embodiment.

[0020] The contents not described in detail in the specification belong to the prior art known to those skilled in the art. In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0021] As shown in Figure 1 The EDI device provided in the embodiment includes, from left to right, an anode plate 1, a first partition plate 2, an anode film 3, a second partition plate 4, at least one set of treatment units, a first cation film 6, a third partition plate 7, a cathode film 8, a fourth partition plate 9, and a cathode plate 10, the treatment units include, from left to right, a second cation film 51, a fifth partition plate 52, a first anion film 53, a sixth partition plate 54, a bipolar membrane 55, a seventh partition plate 56, a third cation film 57, an eighth partition plate 58, a second anion film 59, and a ninth partition plate 510, the sixth partition plate 54 has anion exchange resin 511 therein, the seventh partition plate 56 has cation exchange resin 512 therein, and the water outlet of the sixth partition plate 54 is in communication with the water inlet of the seventh partition plate 56. Raw water enters the sixth partition plate 54, anions in the raw water are adsorbed by the anion exchange resin 511, and are replaced by OH - generated by the bipolar membrane 55 to migrate to a concentrated water chamber surrounded by the second cation film 51, the fifth partition plate 52, and the first anion film 53. At the same time, the anion exchange resin 511 is cleaned online by OH - generated by the bipolar membrane 55, the water outlet of the sixth partition plate 54 enters the seventh partition plate 56, cations in the water are adsorbed by the cation exchange resin 512, and are replaced by H + generated by the bipolar membrane 55 to migrate to a concentrated water chamber surrounded by the third cation film 57, the eighth partition plate 58, and the second anion film 59. At the same time, the cation exchange resin 512 is cleaned online by H + generated by the bipolar membrane 55. In this way, continuous online cleaning is achieved, the frequency of subsequent resin regeneration is reduced, the regeneration period is prolonged, the amount of resin regeneration wastewater is reduced, and the average exchange capacity of the ion exchange resin can be maintained throughout the use cycle, so that the ion exchange resin can continuously and stably provide effective ion exchange service for water treatment and the like.

[0022] The water outlet of the seventh partition plate 56 is communicated with the water inlet of the ninth partition plate 510, and the ninth partition plate 510 is provided with anion-cation exchange resin 513. The water treated by the anion exchange resin 511 and the cation exchange resin 512 enters the ninth partition plate 510, and is further purified by the anion-cation exchange resin 513 to obtain ultrapure water. The corresponding ion membrane and ion exchange resin are added, the high-concentration brine can be treated, and the brine one-step method for preparing ultrapure water can be realized.

[0023] The processing unit is 1-200 groups. According to different water quality, the corresponding processing unit number is selected to ensure the best treatment effect.

[0024] The thicknesses of the first partition plate 2, the second partition plate 4, the third partition plate 7, the fourth partition plate 9, the fifth partition plate 52 and the eighth partition plate 58 are all 1mm, and the structures are the same. The thicknesses of the sixth partition plate 54, the seventh partition plate 56 and the ninth partition plate 510 are all 4mm, and the structures are the same. The thicknesses of the sixth partition plate 54, the seventh partition plate 56 and the ninth partition plate 510 are selected according to the required amount of ion exchange resin to adapt to different operation requirements. The structures of the first cation membrane 6, the second cation membrane 51 and the third cation membrane 57 are the same; the structures of the first anion membrane 53 and the second anion membrane 59 are the same.

[0025] The processing unit of the embodiment is a group, the middle part of the sixth partition plate 54 is provided with a first cavity 541, and the anion exchange resin 511 is arranged in the first cavity 541. The middle part of the seventh partition plate 56 is provided with a second cavity 561, and the cation exchange resin 512 is arranged in the second cavity 561. The middle part of the ninth partition plate 510 is provided with a third cavity 5101, and the anion-cation exchange resin 513 is arranged in the third cavity 5101. The first anion membrane 53, the first cavity 541 and the bipolar membrane 55 surround a fresh water chamber. The bipolar membrane 55, the second cavity 561 and the third cation membrane 57 surround a fresh water chamber. The second anion membrane 59, the third cavity 5101 and the first cation membrane 6 surround a fresh water chamber.

[0026] The above embodiments are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. An EDI device, characterized in that: comprising, from left to right, an anode plate, a first spacer plate, an anode film, a second spacer plate, at least one set of treatment units, a first cation film, a third spacer plate, a cathode film, a fourth spacer plate, and a cathode plate; the treatment units comprise, from left to right, a second cation film, a fifth spacer plate, a first anion film, a sixth spacer plate, a bipolar membrane, a seventh spacer plate, a third cation film, an eighth spacer plate, a second anion film, and a ninth spacer plate; the sixth spacer plate has anion exchange resin therein, and the seventh spacer plate has cation exchange resin therein; the water outlet of the sixth spacer plate is in communication with the water inlet of the seventh spacer plate.

2. The EDI device according to claim 1, characterized in that: the water outlet of the seventh spacer plate is in communication with the water inlet of the ninth spacer plate; the ninth spacer plate has cation and anion exchange resin therein.

3. The EDI device according to claim 1, characterized in that: the treatment units are 1-200 sets in total.

4. The EDI device according to claim 1, characterized in that: the thicknesses of the first, second, third, fourth, fifth, and eighth spacer plates are all 0.5-1 mm.

5. The EDI device according to claim 1, characterized in that: the thicknesses of the sixth, seventh, and ninth spacer plates are all 1-20 mm.

6. The EDI device according to claim 1, characterized in that: the sixth spacer plate has a first cavity in the middle portion, and the anion exchange resin is arranged in the first cavity.

7. The EDI device according to claim 1, characterized in that: the seventh spacer plate has a second cavity in the middle portion, and the cation exchange resin is arranged in the second cavity.

8. The EDI device according to claim 2, characterized in that: the ninth spacer plate has a third cavity in the middle portion, and the cation and anion exchange resin is arranged in the third cavity. ​ ​ ​ ​ ​ ​ ​ ​

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